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Let x stand for the percentage of an individual student's math test score.64 students were sampled at a time.The population mean is 78 percent and

Let x stand for the percentage of an individual student's math test score.64 students were sampled at a time.The population mean is 78 percent and the population standard deviation is 14 percent.

What is the standard deviation of the sampling distribution of sample means?

0.22
14
64
1.75

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